Fluid-pressure motor.



M. H. ROBERTS.

FLUID Pm:

APPLICATION FILED MAY 3, 1912.

SSURE MOTOR.

Patented Nov. 24, 1914.

WITNES MONTAGUE H. ROBERTS, O13 PBOVIDENCE. RHODE ISLAND.

FLUID-PRESSURE MOTQR.

Application filed'May 3, 1912.

ited to such type, and its object is to pro;

vide a valve mechanism therefor, which shall be of simple and inexpensie construction, and which, in operation, shall be exempt from unbalancedpressure and thrust, and be capable of either manual or auto- .maticcontrol for the functions of varying the point of cut-off or reversal ofdirection of rotation of the motor, or of acting as a brake.

The improvement claimed is hereinafter fully set forth. In theaccompanying drawings: Figure 1 is a vertical transverse central sectionthrough a fluid pressure motor, illustrating an embodiment of myinvention; Figs. 2 and 3., horizontal sections through the same, on thelines a a and Z; Z), respectively of Figl 1;Fip; 4, a view, inperspective, of the throttle sleeve; and Fig. 5, a similar view of theinlet valve.

My invention is herein exemplified in an internahcombustion engine,which except as to the features of my invention as hereinafterdescribed, is of the ordinary construction, comprising a cylinder, 1,located above and secured to a closed crank case, 2, in which isj'ournaled a crank shaft, 3, carrying a crank, 3, the crank pin, 3?, ofwhich is coupled, by a connecting rod, 4:, to a piston, 5, reciprocatingin the cylinder, 1.

The cylinder is closed at top by a head, 6,

having a water jacket, 6*, to which, and to a water jacket, 1surrounding the cylinder, water is supplied through a'pipe, 6", Theengine is fitted with other accessories which are common to motors ofthis type, and which, as they do not relate to my present invention,will not be herein described.

In the practice of my invention, the cylinder, 1, is reduced in diameterat and adjacent to its lower end, and a cut off valve, 7, which I hereindesignate as a throttle sleeve, and which is in the form of an openended tubular member, finished truly on its outer and inner surfaces, isfitted to recipro- Specification of Letters Patent.

Patented Nov. 24, 1914;.

Serial No. 84,840.

cate within the cylinder. on the. reduced diameter portion of w ich ithas its lower and outer hearing, and, at and adjacent to its upper end,it has its upper and inner hearing on the periphery of the inwardlyprojectingportion of the cylinder head, 6. An inlet port, '7, and anopposite exhaust port, 7, are formed in the throttle sleeve, said port'sbeing located in position to be brought into register, respectively,with an inlet port, 8, and an exhaust port, 9, on opposi tt sides of. iscylinder. A lug, 7, is formed on or fixed to the lower end of thethrottle sleeve, for the connection of operating mechanism hereinafterdescribed.

The admission and exhaust of motive fluid to and from the cylinder, 1,above the piston, 5, are efiected by an inlet valve, 10, and an exhaustvalve, 11, each of which is in the fo m of a seoqniei'ital plate,finished truly on its inner and outer surfaces, said valves beinginterposed, and fitted to reciprocate, between the bore of the cylinder,1, and the periphery of the throttle sleeve, 7. .The inlet valve, 10, isprovided with a port, 10 near its upper end, in position to be broughtintoregi ister with the inlet port, 8, of the cylinder, and. a lug orpair of jaws, 10 is formed or fixed on its lower end, for connectionwith an operating shaft. The exhaust valve, 11, is similarly providedwith a port, 11, near its upper end, in position tjo'be brought intoregister with the exhaust port, 9, of the cylinder, and a lug or pair ofjaws, 11 is formed or fixed on its lower end, for connection with anoperating shaft.

An inlet valve operating shaft, 12, is journaled parallel with the crankshaft, 3, on one side thereof, and an exhaust valve operating shaft, 13,is similarly journaled on the opposite side of the crank shaft. A timinggear, 14, fixed on the crank shaft, en- ,qaoes a t eaty-15, of largerdiameter on the inlet valve operating shaft, and a similar gear, 16, onthe exhaust valve operating shaft, rotation being thereby imparted tothe valve operating shafts, in the usual manner. The. gears, 11, 15. and16, are indicated by dotted circles in Fig. 1,

The inlet v lve, 10, is reciprocated by the shaft, 12, tllIOL gh a rod,17, connected to the jaws, 10*, at the lower end of the valve, andpassing through a guide bushing, 17 fixed in the lower end of thecylinder, 1, the lower end of the rod, 17, being coupled, by a 'con-'necting rod, 18, to a crank or eccentric on the throttle sleeve iscoupled bymeans of a the shaft, 12. The exhaust valve, 11, is similarlyreciprocated by the shaft, 13, through a rod, 19, connected to the jaws,11", at the lower end of the valve, and passing through a guide bushing,19, fixed in the lower end of the cylinder, 1, the lower end of the rod,19, being coupled, by .a connecting rod, 20, to a crank or eccentric onthe shaft, 13.

The throttle sleeve, 7, being, as before explained, guided at top by itsinternal hearing on the cylinder head, 6, and at bottom by its externalbearing on the bore of the cylinder, it will be seen'that the inlet andoutlet valves, which fit against its periphery, are entirely relievedfrom thrust or pressure exerted by the piston. They are also free toexpand and contract, both longitudinally and circumferentially; are notsubject to any unbalanced pressure; and are removed fremcontact with theexplosive mixture which exerts operative pressure on thepistonin thecombustion chamber between the latter and the cylinder head.

The throttle sleeve, 7, is fitted to-be reciprocated, withthe capacityof variation of the degree and direction of its movement, and thecessation thereof, as from time to time it is desired to vary the pointof cut off, to reverse the direction oi rotation of the crank shaft, orto entirely close communication between the combustion chamber above thepiston and the cylinder inlet and exhaust ports. To this end, the lowerend lug, 7 of depending lug and by a pin, 7 see Fig. l, to a link motionvalve operating gear, comprising a block 21 fitting a longitudinal slotin a segmental valve link, 21, and eccentric rods, 23, by which thelink, 21, is coupled, adjacent to its ends, to cranks or eccentrics onone of the valve operating shafts, in this instance the inlet valveoperating shaft, 12. The linlnQl, is coupled, by a rod, 2%, to an arm,25, fixed on a control or regulating shaft, 96, which may be swung inits bearings, by a manually operated lever, or by a connection to anautomatic governor, to vary the position of the link longitudinallyrelatively to the block, and thereby to vary the point of cut off or toreverse the direction of rotation of the engine, in the well knownmanner of valve gears of this type.

By mo 'ing the link to its central or mid position, the reciprocatingmovement of the throttle sleeve vxill be substantially stopped, andcommunication closed between the combustion'chamber above the piston andthe cylinder inlet and exhaust ports, the movements of the piston-thencausing it to actas a vacuum brake. It will also .be seen that by properadiustments of the link, the degree of compression in the combustionchamber may be v ried desired.

'1 claim as my invention and desire to se-- cure by Letters Patent:

1. In a fluid pr sure motor, the combination of a fixed cylinder havinginlet and exhaust ports, a piston reciprocating therein, a sleeve ortubular cut oil valve fitted to recip rocate between the cylinder andthe piston, said valve having ports registerable with the inlet andexhaust ports and bearing-on fixed cylindrical surfaces of said cylinderat its opposite ends, segmental inlet and exhaust valves, each having aport register-able with one of the ports of the cut off valve and fittedto reciprocate between said valve and the cylinder, means forreciprocating the cut-off valve, and means for independentlyreciprocating the inlet and outlet valves.

In a fluidv )rcssure motor, the combination of a fixed cylinder havinginlet and exhaust ports, a piston reciprocating therein, a

sleeve or tubular cut oil valve fitted to recip- I JCClDl'OCZIllII Li'the cut off valve, and means for indeperulcntly reciprocating thesegmental valve.

MUlVllJiiiLE H. ROBERTS. vi-'itne s:

L iriox 'l'. lloirn, B. A. D. Ci-mnnens.

Copies of this patent may be obtained for five cents each. by addressingthe Comm ssioner of Patents,

Washington, D. C.

